Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0fc301333599e4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 04:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a6d0c755c84a5e80e421f162830fb52 SHA-1: 4edcc08fdf91699c7b7678bb9698baf1cdc09f10 SHA-256: 4b0fc301333599e4a8e60d273bb1f5519adbd9049267d090e8a0da6dade1eebb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to SEO-optimized content, with a primary redirector identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=3d+shapes+worksheet+vertices+edges+faces+pdf PDF link annotation
    • http://zufunepel.iblogger.org/33874021153.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/bejimap.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/apical_dominance.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/accounting_tools_for_business_decision_making_7th_edition.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/fagadotijetesavewevamowot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/bsc_agri_application_form_date_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f451ad86-680a-4dae-8e75-4c87074ec9d6/54441767791.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_f02699a9e1cb44579538dc8bd3c87c38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/how_to_ignore_a_guy_to_get_his_attention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650a3698-c6a0-4397-9f11-b86a8352ada1/sat_test_preparation_classes_near_me.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/gre_math_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/54680244017.pdfIn PDF document text
    • http://gametusepezuka.rf.gd/batman_vs_superman_folder_icon.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_1eb014fa6d214e41a73936143f69a5b2.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_69f88c52403445979ff99c3221898811.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a67870b-ce48-43a8-bd1a-01e11b2b42cc/what_is_the_lost_continent.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_95328e9e4a6546149cb83e3ab3349e7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/assamese_sad_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/tujasobatufesun.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/1314253199.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/49527798154.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/15859818622.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5672 bytes
SHA-256: 773e10b72a168370cba54dcccecc98bd7ad3a41350dc6d8e2e2bdd8261bedd13
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10492 bytes
SHA-256: 6dcb818bd7bf1606db192b735a254147f46503e75c736c6f43cd57d627422968